Grinding-machine.



A. B. LANDIS.

GRINDING MACHINE.

APPLICATION FILED JULY 17,1909.

Patented Feb. 20, 1912.

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A. B. LANDIS.

GRINDING MACHINE. APPLICATION FILED JULY 17 Patented Feb. 20, 1912.

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GRINDING MACHINE.

APPLICATION FILED JULY 17 1909. 1,017,881.

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A. B. LANDIS.

GRINDING MACHINE.

APPLICATION FILED JULY 17,1909.

Patented Feb. 20, 1912.

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' A. B. LANDIS.

GRINDING MACHINE.

APPLICATION FILED JULY 17,1909.

1,017,881, Patented Feb. 20, 1912.

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ABRAHAM B. LANDIS, OF WAYNESBORO, PENNSYLVANIA.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Feb. 20, 1912.

Application filed July 17, 1909. Serial No. 508,232.

To all whom it may concern:

Be it known that I, ABRAHAM B. LANDIS,

a citizen of the United States, residing at.

construction, whereby a machine of this character for this purpose isprovidedadapted to perform the Work automatically and in a veryefficient and expeditious manner, all as willbe hereinafter more fullydescribed and claimed.

Beferring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts, Figure '1is a front elevation of a grinding machine of the character describedembodying my said invention, Fig. 2 anen d elevation thereof showing theparts in the position they occupy during the operation, Fig. 3 a similarview showing the parts in the position they occupy as the work isbeingbrought to position for the operation, Fig. 4: a view partly inhorizontal section and partly in top plan with the parts in the positionshown in Fig. 2, Fig. 5 a central sec-' tional view through thehead-stock and footstock, showing the holding devices on an enlargedscale, Fig. 6 a view similar to a portion of Fig. 5, showing thehead-stock chuck on a still further enlarged scale with the chuck in theposition it occupies when holding the'work, Fig. 7 a similar viewshowing the chuck in position with the work released, Fig. 8 a face viewof Fig.- .7, and Fig. 9 a detail view on the dotted line 99 in Fig. 5.

In said drawings the portions marked A represent the bed of the machine,B the work table and G the grinding wheel base. The bed A may be a bedof a grinding machine of any appropriate general con struction andrequires no detailed description thereof. The work table B is mounted onbed A by means of clamping bolts a in the usual manner and isof a formand construction suitable to support the work-carrying and the feedingmechanism, as will be presently more fully described. The grinding wheelbase 0 is also of any appropriate construction mounted on one side ofthe bed A in the usual or any suitable manner and carries the grindingwheel C mounted in suitable bearingsc, 0' on saidbase provided with adriving pulley C as usual.

The invention relates particularly to the means for feeding and holdingthe work to the grinding wheel which is mounted upon the table B. Itconsists of a work-holding chuck 10 mounted on the innerend of a rodwhich is mounted to slide in the perforation in a hollow head-stockspindle 11. Said spindle is mounted in suitable bearings on thehead-stock frame B and provided with a driving pulley let by which it isgeared to the driving power. Said chuck 10 is secured on the rod 60 by asocket with a screw-threaded connection at .its inner end and at itsouter end is split into several clamping jaws,'as best shown in Fig. 8,the recess in the outer faces of said jaws being adapted to surround thehead ofthe pin to p be ground. The outside surface of the inner end ofsaid chuck is tapered and it is mounted within a tapered socket in theinner end of the spindle 11. A sliding discharging pin 61 is mountedwith itshead in a socket in the inner end of said chuck the pin beingadapted to slide in a central perforation to project beyond its outerface within the jaws and normally held outward by a coiled spring 62inserted between the head of said pin and the inner end of the rod 60.Said chuck 10 is held from turning independently of spindle 11 by atransverse pin 75 mounted in a perforation in said spindle with itsinner end engaging a longitudinal groove in the side of said spindle.Near the outer end of said rod 60 it is provided with a collar 63between which'and a collar 64, abutting the outer end ofspin le 11, ismounted a coiled spring 65 which normally tends to draw said rod 60outwardly and to pull the chuck 10 with its tapered outer face into thetapered socket in the inner end of the outer end of said rod, saidbearing plate being adapted to rotate freely thereon, ballbearings beinginterposed between a head 68 on the outer end' of said rod and the innersurface of said bearing plate. Said plate is preferably formedcup-shaped and adapted to inclose said head 68. A roller 69 is mountedon a shouldered screw 70 in the top of a standard 71 on a bracket 72secured by a bolt 73 to the bed A for a purpose to be presentlydescribed.

The head-stock and foot-stock frames B and B are mounted upon a frame orbase B mounted on pivots b and b which extend through brackets on thefront edge of table B into pivot holes in the ends of said base. Atransverse shaft 15 is mounted in the head-stock frame B immediatelybeneath the head-stock spindle l1 and is provided with a gear g withwhich a worm 16 on said spindle engages. On the outer end of said shaftis mounted a cam 17, which is adapted to rest upon a bearing block 18mounted on a pivot 19 on base B Said cam 17 is concentric with the axisof shaft 15 for the greater portion of its periphery but on one side iscut away as best shown in Fig. 1. During the contact of the concentricportion of the periphery of said cam with bearing block 18 the pivotedbase B will be held in position to support the work in position to beoperated upon by the grinding wheel, but during the contact oftheportion which is eccentric to the axis of said shaft the frame ispermitted to be tilted backward to carry the work away from the grindingwheel for a purpose to be presently described. The tilting base B isthrown back, away from the work, by the action of a spring 20 mounted ina horizontal socket in frame B and bearing against a lunger 29, mountedin the front end of sai socket with its outer end bearing against adepend? ing arm 6 of said tilting base. The holding point 12 in thefoot-stock spindle 21 is normally held against the work under pressureby a spring 22 which surrounds said spindle and bears at its forward endagainst a shoulder therein and at its rear end against a collar 23forming the bearing for its outer end. A wheel 24 with a tapered innerface is mounted on the outer end of said spindle 21 and when the basecarrying the foot-stock is tilted backward said tapered face is adaptedto contact with a roller 25 mounted on the top of a stud shaft in abracket 26 supported from the table B adjacent thereto, which serves todraw, said spindle backward in its bearings and release the holdingpoint from the work.

A work-holding and feeding Wheel 30 is mounted on a shaft 31 in bracketsB also forming a part of the pivoted base B It is provided at regularintervals inits periphery with notches for containing the work, saidnotches being of a depth to receive the pins and hold them so that aportion of their peripheries will project beyond the surface of thewheel for contact with the grinding wheel. A magazine 32, consisting ofan upright with a T-slot to receive the heads of the pins is bolted tothe side of the bracket B and into this the pins are fed by hand,

or any appropriate mechanism. A spring retainer 33 is secured to thefront edge of magazine 32 by a screw 34 and is of a form to extend fromover wheel 30 to a point near the point of contact between the grindingwheel and the work and serves to hold the pins in place, as clearlyshown in Figs. 2 and 3. A similar spring retainer 46 is mounted on theframe under the wheel and extends up adjacent to the point of contactbetween the grinding wheel and work and serves to guide the pins to thepoint of discharge after being ground. The adjacent ends of said springs33 and 46 bear against the pins and steady them during operation. Seedotted lines in Fig. 2. A spring pawl 35 is mounted on a rod 36 mountedrigidly on a shaft 37 on the upper end of a post 38 and is adapted toengage with the notches in the periphery of said wheel 30 and advancesaid wheel step by step during the operation of the machine. A spring 39on said rod 36 bears between the lower end of said pawl and a nut 40 onthe lower end of said rod for operating said pawl. A spring 41 connectedat its upper end to a pin 42 whichprojects into the shaft 37 and atitsother end to a pin 43 in the post 38 operates to hold said pawlforwardnormally in engagement with the periphery of said wheel. A brake wheel44 is mounted on the outer end of a spring 45 secured on the lower endof bracket B and is held by said spring into contact with the peripheryof said wheel and is adapted to engage the notches therein and halt saidwheel in its forward movementinthe proper position for operation.

A diamonding tool 50 is mounted on the forward end of a screw rod 51which is mounted in a transverse perforation in the foot-stock bracket Bin the position for dressing the grinding wheel when needed. Theadjustment of-said screw rod 51 is provided for by nuts 52 and 53engaging with screw-threads thereon in the well known manner. A clampingscrew 54 is arranged to impinge against the side of rod 51 and hold itin any adjusted position.

In operation the pins to be ground being placed in the magazine 32 asshown most plainly in Figs. 2 and 3 and the parts being in operativeposition, as shown in Fig. 2, the grinding wheel C will operate to grindthe face of the pin w (see Fig. 4) which is being rapidly rotated bymeans of the power transmitted to the head-stock spindle 11 through thepulley 14 thereon, the grinding wheel being driven through the pulley Oin the usual manner. As the head-stock spindle 11 revolves the screw 16thereon, operating in mesh with the gear 9 on shaft 15, turns cam 17until its eccentric portion is reached, when the tilting base B ispermitted to tilt backward under the action of spring 20, carrying thework away from the wheel. As the base is tilted backward from theposition shown in Fig. 2 to the position shown in Fig. 3, by reason ofthe power of the spring 20 being greater than the power of the spring39, the pawl 35 on rod 36 is carried downward on said rod and saidspring 39 compressed while spring 41 is extended by the rocking of theshaft 37. The wheel 30 is, however, held by said pawl 35 which engageswith the notch in its periphery so that'this operation will turn itforward slightly on its shaft 31 and bring the magazine 32 back of thenotch with which it registered while standing in operative position.During the tilting back of the base B bearing plate 66 rides over roller69, which brings its central or highest point in line with the axis ofsaid roller and operates to force rod 60 inward releasing the jaws ofchuck 10 from the work w. Cam wheel 24. on spindle 21 then strikesroller 25 and draws back said spindle to release its holding point 12from the work and permit spring 62 operating through discharging pin 61to force the work out of chuck 10 and discharge it from the wheel. Asthecam 17 turns to bring the part concentric with its axis in contact withthe block 18, the base B carrying the work holding devices is tiltedforward, when pawl 35, through the action of spring 39, will operate toturn Wheel 30 until the brake wheel drops into the next notch in theperiphery of said wheel, which will bring the next pin in said wheelinto position to be ground by the grinding wheel C and bring the notchat the top of the wheel into position to receive the next pin from themagazine 32. As the wheel passes to position to bring the pin to intoposition to be ground the tapered wheel 24: is released from contactwith the roller 25 and spring 22 is permitted to force spindle 21forward carrying the holding point 12 against the point of the pin anddriving the head of said pin into chuck 10 carried by spindle 11, whenbearing plate 66 will be moved so that its side, or lower point of itsbearing face, will bear on the side of a strike, such as a wheel 6.9, asshown in Figs. 4 and 5, whenspring will operate to draw rod 60 outwardand the chuck to within the tapered socket in the inner end of thespindle, forcing its jaws firmly onto the work to clamp it and hold itto rotate with said spindle '11, which rapidly rotates the work andsubjects it to the operation of the grinding wheel. Thus the operationmay be continued as long as pins are supplied to the magazine.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, is:

1. In a grinding machine, the combination of a frame, the grindingwheel, and the work-holding and feeding devices comprisgrinding wheel, awork table, work-holding and feeding devices mounted on said tablejcomprising a tilting frame carrying the head-stock and foot-stock and arotary" heel for receiving and carrying forward the pins to operativeposition, and means for operating the frame to carry the work away fromoperative position, substantially as set forth.

3. In a grinding machine, the-combination of a frame, a grinding wheel,means for operating said grinding wheel, a work table, means mounted onsaid work table for holding and feeding the work comprising a head-stockand foot-stock carrying the work-holding means mounted on a tiltingbase, a rotary wheel alsomounted on said base and formed with notches inits periphery to receive and carry the work, means for drivingthe'work-holding means, arotary cam carried on said tilting frame andgeared to the work-driving mechanism, a contact block for said cam onthe work table, and means for holding said tilting frame with said camunder pressure against said. block, substantially as set forth.

at. In a grinding machine, the combination of a frame, a grinding wheel,means for operating said grinding wheel, a work table, means for holdingand feeding the work mounted on said work table comprising a head-stockand foot-stock mounted on a tilting base, said head-stock carrying achuck for clamping one end of the work and said foot-stock carrying aholding point for engaging the other end of the work, means for drivingsaid head-stock, a spring for holding said work engaging holding pointinto contact with the work, a cam on said foot-stock adapted to engage acontact point on the table and withdraw said holding point from the workwhen the table is tilted backward, a rotary wheel formed with notchestoreceive and carry the work, and means for moving said wheel step bystep, substantially as set forth. i

5. In a grinding machine, the combina; tion of a frame, a grindingwheel, means for operating said grinding wheel, a work table,

means for holding and feeding the .work

mounted on said table comprising a headstock and a foot-stock mechanismmounted on a tilting base, means for holding said &

. the work, means for tilting said base to carry the work away fromoperative position, means for releasing the work, a rotary wheel on saidtilting base formed with work-holding notches in its periphery, andmeans for moving said wheel forward step by step between the grindingoperations, substantially as set forth.

6. In a grinding machine, the combination of a frame, a grinding wheel,means for operating said grinding wheel, a work table, work-holding andfeeding devices on said table comprislng a tilting base carrying thefoot-stock and head-stock, said headstock carrying a work-holding chuck,said foot-stock yieldingly mounted and carrying a point for engaging thework, means for withdrawing said point from engagement with the workautomatically as the base is tilted, a rotary wheel also mounted on saidtilting base and formed with workcarrying notches in its periphery,means for holding the work in said notches, and means for advancing saidwheel one notch at each tilting operation of said base, substantially asset forth. 1 p

7. In a grinding machine, the combination ofaframe, a grinding wheel,means for operating said grinding wheel, a tilting base carrying thework-holding and feeding devices, said work-holding and feeding devicescomprising a rotar wheel with work-receiving notches in 1ts periphery, aspring pawl engaging with the notches in the rear of said wheel, meansfor tilting said frame toward and from the operative position, and abrake adapted to engage the notches in the periphery of said wheelsuccessively to halt it atthe point which will bring the work tooperative position, substantially as set forth.

8. A grinding machine for grinding pins,

with said notches for holding the wheel in the proper position and bringthe work to the grinding point, means for tilting said frame, andmeansfor holding and driving the work, substantially asset forth.

9. A grinding machine comprising a frame, grinding mechanism andwork-holding and feeding devices, said work-holding v and feedingdevices being mounted on a tilting frame, and means for tilting saidframe back and forth toward and from the grinding wheel which operationserves to feed the work to the holding devices and the grinding wheel,substantially as set forth.

10. A grinding machine comprising the grinding mechanism, a tiltingframe carrying the work-holding and feeding mechanism, means for holdingsaid frame in position for the grinding wheel to operate upon the work,means fortilting said frame to receive and feed the work, holdingdevices comprising a sliding chuck adapted to receive and clamp thework,a spring for sliding said chuck to clamp the work, and a strike arrangedto contact with a tapered surface and slide said chuck to open it,substantially as set forth.

In witness whereof, I have hereunto set my hand and seal at Washington,District of Columbia this 29th day of June, A. D. nineteen hundred andnine.

-ABRAHAM B. LANDIS. [L. s.]

Witnesses:

E. W. BRADFORD, J. D. YOAKLEY,

